STATSERIAL(1) User Commands STATSERIAL(1)NAME
statserial - display serial port modem status lines
SYNOPSIS
statserial [-n | -d | -x] <device-name>
DESCRIPTION
Statserial displays a table of the signals on a standard 9-pin or 25-pin serial port, and
indicates the status of the handshaking lines. It can be useful for debugging problems
with serial ports or modems.
The optional device-name parameter is the full name of the device file for the serial port
in question. If not specified, the default is taken from the environment variable MODEM if
set, otherwise /dev/cua1.
COMMAND-LINE OPTIONS
Each of the command line options is mutually exclusive.
-n Normally statserial will loop continuously, updating the status at one second inter-
vals; you can exit using Control-C. The -n option disables looping.
-d
With this option the status of the modem is printed as a decimal number. The bits are
encoded as follows (XXX indicates unused bits):
+---+---+---+---+---+---+---+---+---+
| 8 | 7 | 6 | 5 | 4 | 3 | 2 | 1 | 0 |
+---+---+---+---+---+---+---+---+---+
|DSR|RI |DCD|CTS|XXX|XXX|RTS|DTR|XXX|
+---+---+---+---+---+---+---+---+---+
-x This option is the same as -d, except that the output is in hexadecimal.
BUGS/LIMITATIONS
Statserial only works with devices that support the TIOCMGET ioctl.
You need permission to read the device file.
The device file may be locked if other applications are using it.
AUTHOR
Statserial was written by Jeff Tranter (Jeff_Tranter@Mitel.COM), later updated by Frank
Baumgart (godot@uni-paderborn.de) and is released under the conditions of the GNU General
Public License. See the file COPYING and notes in the source code for details.
SEE ALSOsetserial(8)stty(1)
/usr/src/linux/drivers/char/serial.c /usr/include/linux/termios.h
Linux 17 December 1994 STATSERIAL(1)